Rtd; Speaker; Transformer Thermostat; Usb - TurboChef Eco Service Manual

42 OVEN SYSTEMS

RTD

The RTD measures the temperature of the heater
element. If the display reads "999°F/C", the RTD
is open, resulting in an F7or F9 fault. See pages 51
and 52 for troubleshooting.
Testing Procedure:
1. Disconnect the RTD from the control harness.
2. Place the RTD in ice water for two minutes.
3. Take a resistance reading of the RTD.
4. If RTD resistance is not 100 Ω, the RTD is
defective and must be replaced.
NOTE: Use Figure 81 below to determine
resistance readings at temperatures other than
freezing.

Speaker

The speaker provides audible feedback to the oven
operator whenever a key is pressed or a task (such as
a cook cycle) is completed.

Transformer Thermostat

The transformer thermostat is "open-on rise" and
is designed to open at 280ºF (138ºC). When open,
power is interrupted to the transformer.
The thermostat is self-resetting.
NOTE: The transformer thermostat is NOT
interchangeable with the magnetron thermostat.
ºF 0º
90.03 Ω
0º
+200º 135.97 Ω 140.18 Ω 144.38 Ω 148.57 Ω 152.74 Ω 159.90 Ω 161.04 Ω 165.17 Ω 169.29 Ω 173.39 Ω 177.47 Ω
+400º 177.47 Ω 181.54 Ω 185.60 Ω 189.64 Ω 193.67 Ω 197.69 Ω 201.69 Ω 205.67 Ω 209.64 Ω 213.60 Ω 217.54 Ω
217.54 Ω 221.47 Ω 225.38 Ω 229.28 Ω 233.17 Ω 237.04 Ω 240.90 Ω 244.74 Ω 248.57 Ω 252.38 Ω 256.18 Ω
+600º
ºC 0º
0º 100.00 Ω 103.90 Ω 107.79 Ω 111.67 Ω 115.54 Ω 119.40 Ω 123.24 Ω 127.07 Ω 130.89 Ω 134.70 Ω 138.50 Ω
+100º 138.50 Ω 142.29 Ω 146.06 Ω 149.82 Ω 153.58 Ω 157.31 Ω 161.04 Ω 164.76 Ω 168.46 Ω 172.16 Ω 175.84 Ω
175.84 Ω 175.91 Ω 183.17 Ω 186.82 Ω 190.45 Ω 194.07 Ω 197.69 Ω 201.29 Ω 204.88 Ω 208.45 Ω 212.02 Ω
+200º
212.02 Ω 215.57 Ω 219.12 Ω 222.65 Ω 226.17 Ω 229.67 Ω 233.17 Ω 236.65 Ω 240.13 Ω 243.59 Ω 247.04 Ω
+300º
Figure 81: Temperature/Resistance Relationship Class B. Resistance @ 0ºC = 100.0, Alpha = 0.003850
+20º +40º +60º
97.39 Ω 101.74 Ω 106.07 Ω 110.38 Ω 114.68 Ω 118.97 Ω 123.24 Ω 127.50 Ω 131.74 Ω 135.97 Ω
+10º +20º +30º

USB

The USB allows the oven operator to load menus
and firmware updates to and from a USB thumb
drive. For instructions, see pages 20-21.

Voltage Sensor

For North America models only. Voltage selection
is completed at the time of manufacture; however,
if incoming voltage for the store is different than
the preset voltage, the operator will be required to
select either 208 or 240 after turning on the oven.
The correct voltage will be enlarged on the screen,
identifying which option to select.

WiFi Module

The WiFi module allows the oven to connect to the
internet via the store's access point, provided the
user authorizes access and the preset credentials are
entered (see page 15). WiFi must be specified at the
time of the manufature; otherwise the Eco oven will
not include the WiFi module.

Wire Harness

The wire harness distributes power to the oven's
electrical components. See page 63 for a schematic.

Troubleshooting

The control system could potentially be related to
the cause of any fault (see pages 45-53 for detailed
fault troubleshooting).
The control system might also be related to any
issue diagnosed in the section "Non-Fault Code
Troubleshooting" on pages 54-61.
+80º +100º +120º
+40º +50º +60º
+140º +160º +180º
+70º +80º +90º
+200º
+100º